// 所有生产环境
const prodPlugin = [];
if (process.env.NODE_ENV == 'production') {
// 如果是生产环境，则自动清理掉打印的日志，但保留error 与 warn
  prodPlugin.push([
    'transform-remove-console',
    {
      // 保留 console.error 与 console.warn
      exclude: ['error', 'warn']
    }
  ])
}
module.exports = {
  presets: [
    ['@vue/cli-plugin-babel/preset',
      {
        useBuiltIns: 'entry'
      }
    ]
  ],
  plugins: [...prodPlugin],
  env: {
    development: {
      // babel-plugin-dynamic-import-node plugin only does one thing by converting all import() to require().
      // This plugin can significantly increase the speed of hot updates, when you have a large number of pages.
      // https://panjiachen.github.io/vue-element-admin-site/guide/advanced/lazy-loading.html
      plugins: ['dynamic-import-node']
    }
  }
}
